L4938E Datasheet, PDF (1/12 Pages) STMicroelectronics – ADVANCED VOLTAGE REGULATOR

L4938E/ED
®
L4938EPD
ADVANCED VOLTAGE REGULATOR
ENABLE AND SENSE INPUTS (EN, SI) PRO-
TECTED AGAINST NEGATIVE TRANSIENTS
DOWN TO -5V
RESET THRESHOLD ADJUSTABLE FROM
3.8 TO 4.7V
EXTREMELY LOW QUIESCENT CURRENT,
65µA (LESS THAN 90µA) IN STANDBY
MODE
OPERATING DC SUPPLY VOLTAGE RANGE
5V - 28V
OPERATING TRANSIENT SUPPLY VOLT-
AGE UP TO 40V
HIGH PRECISION STANDBY OUTPUT VOLT-
AGE 5V ± 1% WITH 100mA CURRENT CA-
PABILITY
OUTPUT 2 VOLTAGE 5V ± 2% WITH 400mA
CURRENT CAPABILITY (ADJ WIRED TO
V_OUT2)
OUTPUT 2 VOLTAGE ADJUSTABLE BY EX-
TERNAL VOLTAGE DIVIDER
OUTPUT 2 DISABLE FUNCTION FOR
STANDBY MODE
PIN CONNECTIONS
DIP (12+2+2)
SO20 (12+4+4) PowerSO20
ORDERING NUMBERS: L4938E (DIP)
L4938ED (SO)
L4938EPD (PSO)
DESCRIPTION
The L4938E/ED/EPD is a monolithic integrated
dual voltage regulator with two very low dropout
outputs and additional functions as power-on re-
set and input voltage sense. It is designed for
supplying the microcomputer controlled systems
especially in automotive applications.
PR
CT
EN
GND
GND
RES
SO
OUT1
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
D94AT075A
SI
VS1
VS2
GND
GND
N.C.
OUT2
ADJ
PR
CT
EN
GND
GND
GND
GND
RES
SO
OUT1
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
D94AT076A
SI
VS1
VS2
GND
GND
GND
GND
N.C.
OUT2
ADJ
GND
N.C.
V_S2
V_S1
SI
PR
CT
EN
N.C.
GND
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
L4938EPD
GND
N.C.
OUT2
ADJ
OUT1
SO
RESET
N.C.
N.C.
GND
DIP (12+2+2)
SO (12+4+4)
PowerSO20
February 1999
1/12